异形铝材穿孔针挤压成形数字模拟研究  

Digital simulation of piercing needle extrusion forming process of aluminum profile

作　　者：李峰[1] 王敬泽[1] 石连胜[1] 刘洋[1] 王飞[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《模具工业》2011年第11期39-42,共4页Die & Mould Industry

基　　金：黑龙江省教育厅科研项目(11541042);哈尔滨市青年科技创新人才基金(2010RFQXG021)

摘　　要：为了揭示异形铝材穿孔针挤压成形规律,以导弹尾翼为例,采用非线性有限元对其挤压过程进行三维热力耦合模拟,系统地分析了工艺条件对温升变化、附加拉应力及成形载荷的影响规律,研究结果表明:在低速挤压范围,坯料上最高温度峰值均呈减小趋势变化,随挤压速度的增加,最高温度峰值的降幅随之减小,而模口处轴向附加拉应力的数值则相应地增大;成形过程中模口处的轴心部位为高温区,随着轴心距的增加,温度值呈梯度减小的趋势变化;随着凸模压下量的增加,温度减小的梯度趋势逐渐变缓,为异型截面铝材穿孔针挤压成形的工艺设计及变形流动控制提供理论依据。To reveal the law of piercing needle extrusion forming process of heterotypic section aluminum profile, a three-dimensional thermomechanical coupling simulation was cartied out on the extrusion process of a missile empennage by using nonlinear finite element. The influence law of process conditions on the temperature-rise change, additional tensile stress, forming load was analyzed systematically. The results show that： at low speed extrusion, the highest temperature peak of the blank decreases; with the increase of extrusion speed, the decreasing amplitude of the highest temperature peak decreases and the axial additional tensile stress increases; during the forming process, the temperature at the central part of axis is high, the temperature decreases with the increase of axis-to-axis distance; the trend of temperature drop slows gradually with the increase of reduced quantitv of punch.

关 键 词：尾翼 穿孔针挤压 有限元模拟 

分 类 号：TG375.41[金属学及工艺—金属压力加工] O242.21[理学—计算数学]